CMSPageBundle: PageCRUD

- URL property generated (via route!)
- Selected data returned instead of whole Page object
CMSPageBundle: Page Topbar/Toolbar

- toolbar events now bound
- page add successful completion now redirects to the new page
CMSPageJS: Layout toolbar changes

- removed addBlock button (temporarily)
CMSPageBundle: Toolbar CSS fixes
CMSPageJS: Blocks

- layout block placeholder automatic add/removal based on layout having
content
-  deletion of blocks now (haxxly) saves all blocks to ensure its
actually gone